Channgelog for 8.10.3 (#3568) (#3577)

(cherry picked from commit b970bdf)

Co-authored-by: Pierre HILBERT <[email protected]>
(cherry picked from commit c08e8e3)

changelog/8.10.3.asciidoc

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+// begin 8.10.3 relnotes
+
+[[release-notes-8.10.3]]
+==  8.10.3
+
+Review important information about the  8.10.3 release.
+
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+[discrete]
+[[new-features-8.10.3]]
+=== New features
+
+The 8.10.3 release adds the following new and notable features.
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+
+elastic-agent::
+
+* Improve Agent Uninstall On Windows By Adding Delay Between Retries When File Removal Is Blocked By Busy Files. {elastic-agent-pull}https://github.com/elastic/elastic-agent/pull/3431[#https://github.com/elastic/elastic-agent/pull/3431] {elastic-agent-issue}https://github.com/elastic/elastic-agent/issues/3221[#https://github.com/elastic/elastic-agent/issues/3221]
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+[discrete]
+[[bug-fixes-8.10.3]]
+=== Bug fixes
+
+
+elastic-agent::
+
+* Resilient Handling Of Air Gapped Pgp Checks. {elastic-agent-pull}https://github.com/elastic/elastic-agent/pull/3427[#https://github.com/elastic/elastic-agent/pull/3427] {elastic-agent-issue}https://github.com/elastic/elastic-agent/issues/3368[#https://github.com/elastic/elastic-agent/issues/3368]
+
+// end 8.10.3 relnotes

changelog/8.10.3.yaml

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+version: 8.10.3
+entries:
+    - kind: bug-fix
+      summary: Resilient handling of air gapped PGP checks
+      description: Elastic Agent should not fail when remote PGP is specified (or official Elastic fallback PGP used) and remote is not available
+      component: elastic-agent
+      pr:
+        - https://github.com/elastic/elastic-agent/pull/3427
+      issue:
+        - https://github.com/elastic/elastic-agent/issues/3368
+      timestamp: 1695035111
+      file:
+        name: 1695035111-Resilient-handling-of-air-gapped-PGP-checks.yaml
+        checksum: 8741bfa9475a09d5901dc3fab0fed3a06b55d5bb
+    - kind: feature
+      summary: Improve Agent uninstall on Windows by adding delay between retries when file removal is blocked by busy files
+      description: ""
+      component: elastic-agent
+      pr:
+        - https://github.com/elastic/elastic-agent/pull/3431
+      issue: 
+        - https://github.com/elastic/elastic-agent/issues/3221
+      timestamp: 1695050880
+      file:
+        name: 1695050880-Improve-retry-strategy-when-uninstalling-agent.yaml
+        checksum: 45eab228dfd89392a0f3685a628f73ccce05d081